Connecting rod
- Connecting rod inspection
- Connecting rod alignment
- Connecting rod straightening
- Big-end resizing
- Small-end bush replacement
- Small-end bush boring
- Connecting rod honing
- Connecting rod reconditioning
Connecting Rod
Connecting Rod Reconditioning
Restore rod bores, alignment and fastener condition. We check, measure and recondition connecting rods so each rod is straight, correctly sized and ready for the rebuilt assembly.
What this covers
- Cleaning and inspection of each rod and its fasteners
- Straightness and twist checking
- Big-end and small-end bore measurement
- Big-end resizing where measurement requires it
- Rod pairing and identification for the build
Overview
Small parts, measured to the same standard
Connecting rods transfer the full force of combustion to the crank. A twisted or bent rod, or an out-of-round big-end bore, puts the whole reciprocating assembly out of true.
Each rod is checked for straightness and twist, its big-end and small-end bores are measured, and bores are reconditioned to size where required so the rod is square in the engine.
Reconditioned to measurement
Reconditioned to measurement. Not guesswork.
Decisions on connecting rod reconditioning are made from recorded measurements against specification — never from how a part “looks”.
Inspect · Measure · Machine
Symptoms
When is this work needed?
These are the problems and symptoms that typically point to the component needing reconditioning work.
- Knock or noise consistent with a loose or worn big end
- Scored or galled big-end bearings on strip-down
- A rod bent or twisted from a past over-rev or hydraulic event
- Fasteners or rod bolts in doubtful condition
Sub-services
The connecting rod reconditioning jobs covered
Each item is listed so you can see the full scope of this service. Machining jobs run through PRT's inspect, measure, machine and verify route; specialist processes that are arranged externally are called out in the notes.
Inspection
Inspected and measured before machining
5 checks and measurements inform the decision to machine — nothing is cut until the component has been assessed.
- Straightness and twist across the rod
- Big-end bore size, taper and out-of-round
- Small-end bore and bush condition
- Rod bolts, nuts and mating faces
- Cap alignment and identification marks
Measurement & quality
Geometry that keeps the rotating assembly true
A rod that is bent, twisted or out-of-round transfers stress to the crank and piston. Alignment and bore geometry are checked before assembly.
Verified after machining
- Big-end roundness verified with the cap torqued
- Small-end-to-big-end alignment confirmed
- Each rod kept matched to its own cap
PRT process
How we carry out the work
- 01
Receive & inspect
Rods are identified, cleaned and inspected, including their fasteners.
- 02
Check alignment
Straightness and twist are checked across the rod.
- 03
Measure bores
Big-end and small-end bores are measured for size and roundness.
- 04
Recondition
Bores are resized where needed so bearings seat correctly.
- 05
Verify & pair
Final geometry is verified and rods are kept with their matched caps.
Machinery & stations
Performed at the right station, with the right tooling
Each operation is carried out at the appropriate station with the correct tooling. The stations involved in this service are:
- Rod inspection & resizing set-up
- Precision measuring & gauging area
Gallery
From the PRT shop floor
Authentic PRT photography of real jobs will appear here as it is captured and approved.
Connecting Rod Reconditioning work in progress at the PRT facility.
Real photography of the operation will appear here when PRT approves imagery.
Before-and-after records of PRT jobs are published as real projects.
Related services
Work that belongs with this one
Crankshaft Grinding
Restore worn journals to size and true running geometry. Crankshaft grinding returns main and crankpin journals to specification for use with matching undersize bearings.
View serviceEngine Boring & Honing
Cut and finish cylinders to exact size with the correct surface finish. Boring removes the wear and taper; honing produces the plateau finish new rings need to seat.
View serviceEngine Assembly
A controlled, clean, torque-accurate build. We assemble reconditioned engines from measured components — so the finished unit leaves the shop built to specification and ready to run.
View serviceFAQ
Common questions
Straight answers to the questions we expect about this service.
Do connecting rods always need resizing?
No — each rod is measured first. Resizing is only done where the big-end bore is outside its specification.
Are rod bolts replaced?
Fastener condition is assessed during inspection. Fasteners that are doubtful or not reusable by specification are flagged for replacement before assembly.
Why does rod alignment matter?
A rod that is bent or twisted loads the piston sideways in the bore and the journal unevenly, which shortens the life of rings, bearings and the crank itself.
Get a Quote
Discuss a connecting rod reconditioning job
Tell us the engine or component, its condition and what the rebuild needs to achieve. We will confirm the scope from an actual assessment.